尹昕忠^1,,
周本刚²,
陈九辉^1,,,
韦伟²,
谢超^2,3,
郭志¹
1. 中国地震局地质研究所, 地震动力学国家重点实验室, 北京 100029
2. 中国地震局地质研究所, 中国地震局活动构造与火山重点实验室, 北京 100029
3. 中国地震局地震预测研究所, 北京 100036

基金项目: 地震行业科研专项（201508024）和中央级公益性科研院所基本科研业务专项（IGCEA1510，IGCEA1711）联合资助


详细信息

作者简介: 尹昕忠, 男, 1983年生, 博士, 主要从事宽频带地震学和微震检测方面的研究.E-mail:yinxinzhong@ies.ac.cn

通讯作者: 陈九辉, 1969年生, 研究员, 主要从事宽频带地震学和宽频带流动地震台阵探测研究.E-mail:chenjh@ies.ac.cn

中图分类号: P315

收稿日期:2017-12-22
修回日期:2018-05-23
上线日期:2018-06-05

Spatial-temporal distribution characteristics of early aftershocks following the M6.9 Mainling earthquake in Tibet, China

YIN XinZhong^1,,
ZHOU BenGang²,
CHEN JiuHui^1,,,
WEI Wei²,
XIE Chao^2,3,
GUO Zhi¹
1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
2. Key Laboratory of Active Tectonics and Volcano, Institute of Geology, China Earthquake Administration, Beijing 100029, China
3. Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China


More Information

Corresponding author: CHEN JiuHui,E-mail:chenjh@ies.ac.cn

MSC: P315

--> Received Date: 22 December 2017
Revised Date: 23 May 2018
Available Online: 05 June 2018


摘要
摘要:北京时间2017年11月18日06时34分（GMT：2017-11-17 22:34），西藏自治区林芝市米林县发生了M6.9地震.本次地震位于东喜马拉雅东构造结末端旋转变形强烈部位.本研究基于林芝台阵记录的波形数据，应用双差定位方法和匹配滤波方法对本次地震早期余震序列进行了全面检测分析.截至2017年11月25日上午08时，我们共获得约10倍的中国地震台网公布的余震事件.余震的时空分布特征显示，本次米林M6.9地震余震呈NW向，位于北东向南迦巴瓦构造结北部的东西两侧边界断裂带之间，沿西兴拉断裂带分布，断层具有明显的分段破裂特征，主震位于余震分布带中部.根据余震分布特征以及震源机制解显示，发震断层的深部几何结构为北东向陡倾，主震北东侧的断层活动为主震及发震断层触发的结果，其深部几何结构也较陡，余震整体沿断层分布长度约50 km.
关键词: 米林M6.9地震/
微震检测/
发震构造/
东喜马拉雅构造结

Abstract:An M6.9 earthquake occurred at 06:34 CST (2017-11-17 22:34 GMT) on 18 November 2017 at Mainling prefecture, Nyingchi city, Tibet. This earthquake is located near the northeastern corner of the eastern Himalayan syntaxis where strong crustal shortening and the tectonically rotated deformation occurred. Based on the waveform data recorded by the Nyingchi Array, we applied the waveform matched-filter technique and double difference earthquake location method to analyze the spatial-temporal evolution of early aftershocks following the main shock. We obtained over 10 times more aftershocks than that in the catalog from the China Earthquake Network Center. Our analysis indicates that the aftershocks are mainly distributed in north-west direction, which are located on the Xixingla fault and between the east and west sides of the boundary fault zone north of the Namcha Barwa syntaxis. The fault has the clearly segmental rupture characteristics and the main shock is located in the central part of the aftershock belt. Combined the results of the focal mechanism solutions, we suggest that the seismogenic fault of this event steeply dips to northeast and its segment to the northeast of the main shock's epicenter could be triggered by the main shock. The overall length of the aftershocks is about 50 km along the fault.
Key words:Mainling M6.9 earthquake/
Microseismic detection/
Seismogenic structure/
Eastern Himalayan Syntaxis



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